Test migration to jest by hand

Apparently using regular expressions is way easier.

test/initializeNDArray/initializeNDArray.js

@@ -0,0 +1,5 @@
+const initializeNDArray = (val, ...args) =>
+args.length === 0
+? val
+: Array.from({ length: args[0] }).map(() => initializeNDArray(val, ...args.slice(1)));
+module.exports = initializeNDArray;